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United States Patent | 5,309,416 |
Iwanaga ,   et al. | May 3, 1994 |
A method for initializing a magnetooptical recording medium having tracks onto which information is recorded are formed in parallel and having intermediate regions among the tracks. The method includes the steps of scanning a track by a laser beam while applying a magnetic field in a predetermined direction, thereby aligning magnetizing directions of the track; and scanning the intermediate region by the laser beam while applying a magnetic field in a predetermined direction, thereby aligning the magnetizing directions of the intermediate region. An apparatus to perform such a method is also disclosed.
Inventors: | Iwanaga; Ryuichi (Kawasaki, JP); Tsukada; Masaharu (Kawasaki, JP) |
Assignee: | Canon Kabushiki Kaisha (Tokyo, JP) |
Appl. No.: | 082507 |
Filed: | June 25, 1993 |
Apr 26, 1988[JP] | 63-101253 | |
Apr 27, 1988[JP] | 63-102746 | |
Jun 29, 1988[JP] | 63-159305 |
Current U.S. Class: | 369/13.03; 369/275.4 |
Intern'l Class: | G11B 011/00 |
Field of Search: | 360/114,59 369/13,275.4,110,44.23,44.24,14,100,275.2,275.3 365/122 |
3876842 | Apr., 1975 | Bouwhuis | 369/109. |
4325135 | Apr., 1982 | Dil et al. | 369/275. |
4410969 | Oct., 1983 | Maeda | 369/46. |
4472748 | Sep., 1984 | Kato et al. | 360/59. |
4539662 | Sep., 1985 | Hatano et al. | 369/13. |
4703469 | Oct., 1987 | Pettigrew et al. | 369/110. |
4706232 | Nov., 1987 | Funada et al. | 369/13. |
4853912 | Aug., 1989 | Akasaka et al. | 360/59. |
Foreign Patent Documents | |||
0252445 | Jan., 1988 | EP. | |
2139784 | Nov., 1984 | GB | 369/13. |